CRAcorrectionOmniVision CRA CorrectionMatching Sensors to Lenses for Better Imaging SystemsJune 2009Security B: Highly Confidential 1Agenda What is CRA? How CRA affects light collection efficiency of the sensor How to make your selection SummarySecurity B: Highly Confidential 2What is CRA? CRA is an acronym for Chief Ray Angle The angle of the incident rays passing through the center of the lens aperture Measured at the image sensor Center of the sensor CRA=0° CRA typically increases for pixels furthest away from the center of the sensorChief Ray 1 Lens Aperture Image SensorChief Ray 2CRA 1 Optical axisHalf Field of View CRA 2Security B: Highly Confidential 3Light collection efficiency reductionOn-Axis PixelCRA=0°Off-Axis PixelCRA=25° Common CMOS pixels behave l……